[MERGE] Unify PO extraction system between server/addons and web + minor cleanup

openerp/addons/base/__openerp__.py

openerp/addons/base/ir/ir.xml

openerp/addons/base/ir/ir_translation.py

openerp/addons/base/ir/ir_translation_view.xml

openerp/addons/base/ir/wizard/__init__.py

openerp/addons/base/ir/wizard/wizard_menu.py

openerp/addons/base/ir/wizard/wizard_screen.py

openerp/addons/base/module/module.py

openerp/addons/base/module/wizard/base_export_language.py

...p/addons/base/module/wizard/base_export_language_view.xml

openerp/addons/base/module/wizard/base_import_language.py

...p/addons/base/module/wizard/base_import_language_view.xml

openerp/addons/base/module/wizard/base_language_install.py

openerp/addons/base/module/wizard/base_module_import.py

openerp/addons/base/module/wizard/base_module_update.py

...erp/addons/base/module/wizard/base_update_translations.py

...dons/base/module/wizard/base_update_translations_view.xml

openerp/addons/base/res/res_config.py

openerp/tools/translate.py